氧化还原
法拉第效率
电化学
材料科学
磁滞
阳离子聚合
电极
化学物理
化学工程
无机化学
物理化学
化学
凝聚态物理
高分子化学
物理
工程类
冶金
作者
Kun Dai,Jing Mao,Zengqing Zhuo,Yan Feng,Wenfeng Mao,Guo Ai,Feng Pan,Yi‐De Chuang,Gao Liu,Wanli Yang
出处
期刊:Nano Energy
[Elsevier]
日期:2020-08-01
卷期号:74: 104831-104831
被引量:72
标识
DOI:10.1016/j.nanoen.2020.104831
摘要
Lattice anionic (oxygen) redox reactions (ARR) offers opportunities for developing high-capacity batteries, however, often suffers the notoriously high hysteresis in voltages and low initial coulombic efficiency. Particularly, ARR was widely considered inherent to these kinetic issues. In this paper, unambiguous evidences of strong and reversible ARR is found in Na2/3Ni1/3Mn2/3O2 through mapping of resonant inelastic X-ray scattering (mRIXS). Strikingly, the material displays negligible voltage hysteresis (0.1 V) and high initial coulombic efficiency with a highly stable electrochemical profile. Our independent analysis of the Ni, Mn and O states consistently interpret the redox mechanism of Na2/3Ni1/3Mn2/3O2, which reveals a strong ARR system with facile kinetics and highly stable electrochemical profile that previously found only in cationic redox systems of conventional non-Alkali-rich materials.
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